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Comprehensive .NET and C# Version History Guide

Explore the evolution of Microsoft’s flagship development platform and its flagship language, C#. This guide highlights key milestones, release dates, and the features that shaped modern .NET development.

.NET Framework Version History

The first release, .NET Framework 1.0, debuted in 2002. Since then the platform has matured through numerous updates, culminating in the latest supported release, .NET Framework 4.7.1 (October 2017). Each version introduced significant improvements, including the introduction of the Entity Framework in 3.5, which transformed data‑access patterns.

VersionCLR VersionRelease Date
1.01.02002‑02‑13
1.11.12003‑04‑24
2.02.02005‑11‑07
3.02.02006‑11‑06
3.52.02007‑11‑19
4.042010‑04‑12
4.542012‑08‑15
4.5.142013‑10‑17
4.5.242014‑05‑05
4.642015‑07‑20
4.6.142015‑11‑17
4.6.242016‑08‑02
4.742017‑04‑05
4.7.142017‑10‑17

The .NET Framework remains a cornerstone for Windows‑centric development, with Microsoft ensuring compatibility across all supported Windows operating systems.

C# Version History

Version.NET FrameworkVisual StudioKey Features
C# 1.01.0/1.1Visual Studio .NET 2002Initial language release
C# 2.02.0Visual Studio 2005
  • Generics
  • Partial types
  • Anonymous methods
  • Nullable types
  • Iterators
  • Covariance & contravariance
C# 3.03.0/3.5Visual Studio 2008
  • Auto‑implemented properties
  • Anonymous types
  • Query expressions (LINQ)
  • Lambda expressions
  • Expression trees
  • Extension methods
C# 4.04.0Visual Studio 2010
  • Dynamic binding
  • Named & optional arguments
  • Generic covariance & contravariance
  • Embedded interop types
C# 5.04.5Visual Studio 2012/2013
  • Async/await
  • Caller info attributes
C# 6.04.6Visual Studio 2013/2015
  • Static imports (using static)
  • Exception filters
  • Property initializers
  • Expression‑bodied members
  • Null‑propagation operator
  • String interpolation
  • nameof operator
  • Dictionary initializer
C# 7.0.NET CoreVisual Studio 2017
  • Value tuples
  • Pattern matching
  • Local functions
  • Out variable declarations
  • Ref returns & locals
  • More powerful async features

Why This Matters

Understanding the historical context of .NET and C# releases equips developers to choose the right tools, anticipate feature deprecations, and leverage modern language capabilities for robust, high‑performance applications.

C Language

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